Piston-rod packing



(No Modem L. SHOOK.

PISTON ROD PACKING. No. 315,350. l Patented Apr. 7, 1885.

WW u@ 27295 Z1-r -yao/t 'WTNBSSES i INVENTOR ATTORNEYS N. PKYERS. Plwlhugnphef. Washington. D. C.

UNITED STATES PATENT OFFICE.

LEVI SHOOK, OF PITTSBURG, PENNSYLVANIA.

PlST-ON--ROD PACKING.

SPECIFICATION forming part of Letters Patent No. 315,350, dated Aprn '1, 1885.

Application filed October 21, 1884. (No model.)

- To a/ZZ whom it may concern.-

Be it known that I, LEVI Snoox, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Piston-Packings; and I do hereby declare that the following is a full, clear7 and exact description of the invention, which will enable others skilled `in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates' to piston-packings; and it has for its object theprovision of means for avoiding excessive tightening ofthe packing, and for allowing all desirable freedom of vibration of the piston-rod without destroying the steam-tight joint. These features are especially useful and desirable in` all engines having very long connections between the cylinder andthe crank or walking-beamsuch as are generally used on steam-vessels- The invention consists in thevnovel construction and arrangement of parts, as hereinafter fully described and claimed.

In these very long connected engines, especially horizontal engines for stern-wheel boats, the frame of the deck is diicult to brace with sufficient stiffness to give a durable stability to the enginesetting, and from use the setting becomes disturbed. This of course affects the operation of the piston-rod, making it bind in the stuffing-box on one side and get more or less loose on the other. In this event the packing must be very tight and distributed over a considerable surface of the piston to make a steani'tight joint. The consequence is great heating of the rod, increase of friction, and, frequently, a permanent set77 appears in the rod.

My invention is as follows: Figure 1 is a vertical longitudinal section of my improvement, and Figs. 2. and 3 details of the same. A is the cylinder-head, and B its usual stuffing-box, having in its walls the T shape recesses c c for the reception of the T-shaped headed bolts d d, two or more, as shown. Bolts d are threaded nearly throughout. On the shoulder at the bottom of box B are placed the two guard-rings e e', as usual. The outerend ofthe box B is surfaced off true, and against this I place the extensionbox F, having lugs g, perforated for the passage of the bolts d freely. Nuts h are theii run down on bolts ld till they bind the box F against box B, as shown, but not so tightly` that the former cannot slide laterally across the face of the latter.

I is the piston-rod. Its packing k is put L on and pushed intothestufting-box B, and

partially filling the extension-box F. Then' box B, and the packing accommodates itself.

The result of this construction is that the packing is only moderately compressed, and l i.

the'joint kept steam-tight withoutexcessive friction and consequent heat.` The absence` of heat from tight packing and excessive fricg tion in vibrating entirely does away with the use of cold water, which has become so common, and which only damages the pistonrod and hastens its permanent set. Anyamount of vibration may occur in my packing without requiring setting up of the gland.

I claim as my invention- 1. In piston-rodpacking devices, the combination, with the ordinary stuffingbox,-of`

an additional stuffing-box attached thereto, and adapted to `slide laterally thereon in conformity with the vibrations of the rod, sub-l stantially as described.

2. The combination, with box B, of the ex` tension-box F, bolts d, nuts h, ring 1, rod I,

babbitted follower M, and nuts n, and the packing, substantially as described.

3. In piston-rod-packing devices, the box F, adapted for movable attachment to an ordinary stuffing-box, upon which it moves or f slides laterally, the ring Z, and the adjustable p follower M, substantially as described...

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

LEVI SHOCK.

Witnesses:

GEO. W. BAoxoFnN, ALvA A. MOORE.

IOS 

